|
Problem IC73185
|
Status: Closed |
DB2 MIGHT ENCOUNTER 'DEAD LATCH' ISSUE AND INSTANCE WILL HANG. |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
To identify the problem, issue 'db2fodc -hang' command to
generate diagnostic information. Then in stack files you will
see 2 agents similar to the followings:
================================
<StackTrace>
sqloXlatchConflict
sqlpm_write_appl_locks
sqm_snap_appl_locks
sqm_snap_db_locks
sqlmonssagnt
<LatchInformation>
Waiting on latch type: (SQLO_LT_SQLP_TENTRY__tranEntryLatch) -
Address: (7000001bc956e68), Line: 748, File:
/view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqlpi_inlines.h
Holding Latch type: (SQLO_LT_sqeLocalDatabase__dblatch) -
Address: (780000000780328), Line: 395, File: sqlmutil.C
HoldCount: 1
Holding Latch type: (SQLO_LT_sqeAppServices__m_appServLatch) -
Address: (7800000002f04f8), Line: 7822, File: sqlmonss.C
HoldCount: 1
Holding Latch type: (SQLO_LT_sqeApplication__masterAppLatch) -
Address: (7000002513101c4), Line: 327, File:
/view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqle_app_service
s.h
HoldCount: 1
...
<StackTrace>
sqloXlatchConflict
sqlkdDispatchRequest
sqlkdInterrupt
sqlrr2pd
sqlrkcmt
sqlrkcm
sqlrrcom_dps
sqlrr_xcommit
<LatchInformation>
Waiting on latch type: (SQLO_LT_sqeApplication__masterAppLatch)
- Address: (7000002513101c4), Line: 997, File:
/view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqle_application
.h
Holding Latch type: (SQLO_LT_SQLP_TENTRY__tranEntryLatch) -
Address: (7000001bc956e68), Line: 748, File:
/view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqlpi_inlines.h
HoldCount: 1
================================
The deadlatch is constructed by 'masterAppLatch' and
'tranEntryLatch'.
You will have to recycle the instance to get out of the 'dead
latch' situation. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* To identify the problem, issue 'db2fodc -hang' command to *
* generate diagnostic information. Then in stack files you *
* will see 2 agents similar to the followings: *
* ================================ *
* <StackTrace> *
* sqloXlatchConflict *
* sqlpm_write_appl_locks *
* sqm_snap_appl_locks *
* sqm_snap_db_locks *
* sqlmonssagnt *
* *
* <LatchInformation> *
* Waiting on latch type: (SQLO_LT_SQLP_TENTRY__tranEntryLatch) *
* - Address: (7000001bc956e68), Line: 748, File: *
* /view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqlpi_inlines.
* *
* Holding Latch type: (SQLO_LT_sqeLocalDatabase__dblatch) - *
* Address: (780000000780328), Line: 395, File: sqlmutil.C *
* HoldCount: 1 *
* Holding Latch type: (SQLO_LT_sqeAppServices__m_appServLatch) *
* - Address: (7800000002f04f8), Line: 7822, File: sqlmonss.C *
* HoldCount: 1 *
* Holding Latch type: (SQLO_LT_sqeApplication__masterAppLatch) *
* - Address: (7000002513101c4), Line: 327, File: *
* /view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqle_app_servi
* HoldCount: 1 *
* *
* ... *
* *
* <StackTrace> *
* sqloXlatchConflict *
* sqlkdDispatchRequest *
* sqlkdInterrupt *
* sqlrr2pd *
* sqlrkcmt *
* sqlrkcm *
* sqlrrcom_dps *
* sqlrr_xcommit *
* *
* <LatchInformation> *
* Waiting on latch type: *
* (SQLO_LT_sqeApplication__masterAppLatch) - Address: *
* (7000002513101c4), Line: 997, File: *
* /view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqle_applicati
* *
* Holding Latch type: (SQLO_LT_SQLP_TENTRY__tranEntryLatch) - *
* Address: (7000001bc956e68), Line: 748, File: *
* /view/db2_v97fp2_aix64_s100514/vbs/engn/include/sqlpi_inlines.
* HoldCount: 1 *
* ================================ *
* The deadlatch is constructed by 'masterAppLatch' and *
* 'tranEntryLatch'. *
* *
* You will have to recycle the instance to get out of the *
* 'dead latch' situation. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to db2 version 9.7 fp 4 *
**************************************************************** |
| Local Fix: |
The problem only occurs when you're getting snapshot. So it can
be avoided if you don't get any snapshot. |
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 10.12.2010
10.12.2010
10.12.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP4
|
| Problem solved according to the fixlist(s) of the following version(s) |
